06015: All sets: Emulation speed drop from 100% to

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
06015	Speed	Major	Always	Aug 16, 2015, 10:29	Aug 18, 2015, 00:23

Tester	wallyweek	View Status	Public	Platform	SDLMAME
Assigned To		Resolution	Open	OS	Linux
Status [?]	Acknowledged			Driver	namco/namcos1.cpp
Version	0.164	Fixed in Version		Build	64-bit
		Fixed in Git Commit		Github Pull Request #

Summary	06015: All sets: Emulation speed drop from 100% to <60%
Description	On my Ubuntu 15.04 box I see an emulation speed drop for all sets to about 60%. It happened after 0.160 which is the last release I can test. Please find the result of mame -verbose pacmania for both versions in attachment.
Steps To Reproduce
Additional Information
Github Commit

Flags
Regression Version
Affected Sets / Systems	All sets

Attached Files	pacmania_logs.zip (4,011 bytes) Aug 16, 2015, 10:29 Uploaded by wallyweek Pacmania verbose logs

No.11959 wallyweek Tester Aug 16, 2015, 10:58	Update: the same issue applies to all sets of namcos2.c
No.11961 Tafoid Administrator Aug 17, 2015, 02:35	namcos1.c there was a performance decrease just after 0.163 was released and effects namcos1 which I assume will be revisited again [ https://github.com/mamedev/mame/commit/0f151264284052e9a3a2b39a2c0772c843069ba4 ] as well as some changes regarding games using 6809 cpus. I don't think those could be construed as emulation errors. I didn't see much loss when checking namcos2.c games other than the minor loss related to 6809 stuff. . Those games should still run run fast enough even on the low end pentium 4's.. not entirely sure what you are running?
No.11962 wallyweek Tester Aug 17, 2015, 19:49 edited on: Aug 17, 2015, 19:50	Short summary from system messages: CPU: AMD Athlon(tm) X2 Dual Core Processor BE-2350 2.100 MHz Memory: 4gb GFX card: NVIDIA Corporation GT215 [GeForce GT 240] (rev a2) I admit it's not the fastest choice, but should be enough to emulate games so old, and indeed they performed good before 0.164. ;-)
No.11966 NekoEd Senior Tester Aug 18, 2015, 00:20	This is a slight bit of detriment due to overall code improvements; the way things were done was changed, and the old optimizations no longer worked. They'll be replaced in the future. In the meantime, please pardon our dust, we apologize for the inconvenience.